The Oscar-winning actor and director of blockbuster "The Passion of the Christ" went public about his romance with Grigorieva shortly after filing for divorce in April 2009 from his wife of nearly 30 years, Robyn.

People.com said the pair "just drifted apart" and quoted an unnamed friend as saying the split was amicable and that they hoped to raise their baby, Lucia, together.

Grigorieva, a classical pianist and model, released a debut pop music album in August. Gibson directed the music videos for four of the songs. She also has a teenage son with former James Bond actor Timothy Dalton.

Gibson, who made headlines worldwide in 2006 for a drunk driving arrest and anti-Semitic tirade, returned to movie acting in January with the thriller "Edge of Darkness" after an eight-year break.